Lennox Q90-100 Series IV Installation Instructions Manual

Brand: Lennox

Model: Q90-100 Series IV

Category: Water heaters & boilers

Type: Installation Instructions Manual

This manual is also suitable for

INSTALLATION MANUAL

An ISO 9001-2000 Certied Company

MEMBER: The Hydronics Institute

P/N# 14683301, Rev. A [08/08]

GAS-FIRED, DIRECT VENT,

CONDENSING, HOT WATER BOILER

DUNKIRK BOILERS

85 Middle Rd.

Dunkirk, NY 14048

www.dunkirk.com



󰮐













Improper installation, adjustment, alteration, service,

or maintenance can cause injury or property damage.

Refer to this manual. For assistance or additional in-

formation consult a qualied installer, service agency,

or the gas supplier.

Read all instructions carefully before starting the

installation.

Save this manual for reference.

WARNING

CAUTION



 

 

 

 

 

A. Codes ..............................................................................................................................................................................................10

B. Boiler Sizing .................................................................................................................................................................................. 11

C. Considerations For Boiler Location ...........................................................................................................................................11

D. Locating e Boiler ......................................................................................................................................................................12

E. Combustion Air And Vent Pipe Requirements ........................................................................................................................12

F. Condensate Drain Requirements ................................................................................................................................................ 13

G. Foundation Requirements ........................................................................................................................................................... 14

H. Removal Of Existing Boiler From Common Vent System .....................................................................................................14

 

 

A. Supply And Return Lines ............................................................................................................................................................ 15

B. Pressure Relief Valve ....................................................................................................................................................................19

C. Expansion Tank And Make-Up Water ....................................................................................................................................... 19

D. Condensate Drain Piping ............................................................................................................................................................ 22

E. Filling Condensate Trap With Water ......................................................................................................................................... 23

F. Chilled Water Piping .....................................................................................................................................................................23

 

A. Connections And Termination ................................................................................................................................................... 23

B. Installation .....................................................................................................................................................................................29

 

A. Check Gas Supply .........................................................................................................................................................................29

B. Connecting e Gas Piping .........................................................................................................................................................30

C. Checking e Gas Piping ............................................................................................................................................................30

 

A. Electric Power Supply .................................................................................................................................................................31

B. Install Your ermostat ................................................................................................................................................................32

C. Connect Circulator Pump Wiring .............................................................................................................................................. 32

 

A. Integrated Boiler Control (IBC) ................................................................................................................................................36

B. Gas Control Valve ........................................................................................................................................................................36

C. Hot Surface Igniter ......................................................................................................................................................................36

D. High Limit Aquastat Control .....................................................................................................................................................36

E. Dra Inducer Temperature Safety Switch ................................................................................................................................. 36

F. Casting Temperature Safety Switch .............................................................................................................................................36



G. Dierential Pressure Air Proving Switch/Blocked Vent Safety Shuto ................................................................................. 36

H. Dra Inducer ................................................................................................................................................................................37

I. Circulator Pump ............................................................................................................................................................................ 37

J. Drain Valve ..................................................................................................................................................................................... 37

K. A.S.M.E. Rated Pressure Relief Valve ........................................................................................................................................ 37

L. Blocked Vent Safety Shuto ........................................................................................................................................................ 37

M. External Condensate Pump (Optional) ................................................................................................................................... 37

 

Piping Recommendations ................................................................................................................................................................ 38

Water Chemistry ................................................................................................................................................................................ 38

Cleaning the Hydronic System ........................................................................................................................................................ 39

Freeze Protection ............................................................................................................................................................................... 39

 

A – Filling Boiler With Water And Purging Air For Systems With Diaphragm Type Expansion Tanks ..............................40

B – Purging Air For Systems With Conventional Closed Type Expansion Tanks: ................................................................... 40

C - Placing Boiler In Operation ....................................................................................................................................................... 41

 

A. Verify Proper Sequence Of Operation ...................................................................................................................................... 42

B. Inspect Venting And Air Intake System ..................................................................................................................................... 43

C. Inspect Condensate Drain ........................................................................................................................................................... 43

D. Inspect System Piping .................................................................................................................................................................. 43

E. Test Ignition System Safety Shuto Device ................................................................................................................................43

F. Test High Limit Control And Adjust .......................................................................................................................................... 44

G. Test Other Safety Controls .......................................................................................................................................................... 44

H. Set ermostat Heat Anticipator (If Used) And Verify ermostat Operation ..................................................................44

I. Measure e Natural Gas Input Rate .......................................................................................................................................... 44

J. Set ermostat To Desired Room Temperature .........................................................................................................................45

K. Review All Instructions ............................................................................................................................................................... 45

 

Beginning Of Each Heating Season ................................................................................................................................................48

Daily During Heating Season .......................................................................................................................................................... 48

Monthly During Heating Season .....................................................................................................................................................49

Periodically During Heating Season ...............................................................................................................................................49

End Of Each Heating Season - Annual Shutdown Procedure ..................................................................................................... 49

Annual Examination And Cleaning Of Boiler Components.......................................................................................................49

 

 

󰮏 

 

is appliance is a gas-red direct vent hot water boiler with

cast aluminum boiler sections. A revolutionary cast aluminum

heat exchanger means better heat transfer and thermal storage

than similarly sized cast iron boilers, which results in higher

eciency. e heating system water absorbs large amounts of

heat from the cast aluminum heat exchanger, cooling the ue

gases and causing condensation. Sealed combustion, premix

gas burner, and low ame temperature means drastically

reduced CO and NOx emissions, which contribute to a cleaner

and healthier environment.

is appliance, unlike normal residential atmospheric and

induced dra units, takes its combustion air directly from

the outdoors (sealed combustion) and does not compete with

building occupants for fresh air. Sealed combustion (also

known as “direct vent”) is the safest and best way to obtain

plenty of clean combustion air. e induced dra fan draws

in the outside combustion air, then takes the cooler ue gases

from the boiler unit and provides a positive removal of the ue

gases from the building through inexpensive and readily avail-

able PVC and CPVC pipes.





TABLE #1 – SEA LEVEL RATINGS – NATURAL AND PROPANE GASES

Model

Input

*(MBH)

++ Heating Capacity

*(MBH)

Net I=B=R Rating

*(MBH)

Shipping

Weight (lbs.)

Flue Dia.

90-50 50 45 39 220 2” CPVC & PVC

90-75 75 68 59 220 2” CPVC & PVC

90-100 100 90 78 220 2” CPVC & PVC

* 1 MBH = 1,000 Btuh Btuh = British ermal Units Per Hour

ese low pressure gas-red hot water boilers are design certi-

ed by CSA International for use with natural and propane

gases. e boilers are constructed and hydrostatically tested for

a maximum working pressure of 50 psig (pounds per square

inch gage) in accordance with A.S.M.E. (American Society of

Mechanical Engineers) Boiler and Pressure Vessel Code Sec-

tion IV Standards for heating boilers.

++ AFUE (Annual Fuel Utilization Eciency) and Heating

Capacity is based on the D.O.E. (Department of Energy) test

procedure.

e Boilers are certied in accordance with ANSI (American

National Standards Institute) Z21.13 standards as gas-red,

direct vent, condensing, hot water boilers.

e Heating Capacity indicates the amount of heat available

aer subtracting the losses up the stack. Most of this heat is

available to heat water. A small portion is heat from the jacket

and surfaces of the boiler, and it is assumed that this heat stays

in the structure. e Net I=B=R Rating represents the portion

of the remaining heat that can be applied to heat the radiation

or terminal units (i.e. nned tube baseboard, cast iron radia-

tors, radiant oor, etc.). e dierence between the Heating

Capacity and the Net I=B=R Rating, called the piping and

pickup allowance, establishes a reserve for heating the volume

of water in the system and osetting heat losses from the pip-

ing.

e Net I=B R Ratings shown are based on a piping and pickup

factor of 1.15 in accordance with the I=B=R Standard as pub-

lished by the Hydronics Institute. e Net I=B=R Rating of the

boiler selected should be greater than or equal to the calculated

peak heating load (heat loss) for the building or area(s) served

by the boiler and associated hot water heating systems. e

manufacturer should be consulted before selecting a boiler for

installations having unusual piping and pickup requirements.

e boilers are factory equipped for operation at altitudes

ranging from 0-2,000 feet above sea level. For use of these boil-

ers at altitudes above 2,000 feet above sea level, the gas input

ratings (MBH) automatically reduced.



e boilers (with the exception of the 90-75 LP product)

are factory equipped for operation at altitudes ranging from

0-10,000 feet above sea level. No changes to the factory settings

are required for installations from 0-5,000 feet above sea level.

For altitudes from 5,000-10,000 feet above sea level the gas

manifold pressure will need to be adjusted based upon caloric

(Btu) value of supply gas (contact local gas utility or distributor

for this value). For specic settings refer to Table #1 for natural

gas applications and Table #2 for LP gas applications. Instruc-

tions on how to adjust the gas manifold pressure settings are

shown in

Figures #17 & #18

Note that 90-75 LP applications for 5,000 - 10,000 feet above

sea level will require an orice change as well as a gas manifold

pressure adjustment based upon caloric (Btu) value of supply

gas. Refer to Table #2 for altitude orice kit part number. For

replacing the orice refer to specic instructions included with

the kit.

TABLE #1: SERIES 90 NATURAL GAS

SERIES 90-50

Stock Factory Btu Value of Natural Gas++

Settings 750 850 950 1000 1050

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 50 – – – – –

Manifold Pressure In W.C. 2.5 4 4 3.5 2.5 2.5

Orice 43331094 43331094

SERIES 90-75

Stock Factory Btu Value of Natural Gas++

Settings 750 850 950 1000 1050

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 75 – – – – –

Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5

Orice 43331092 43331092

SERIES 90-100

Stock Factory Btu Value of Natural Gas++

Settings 750 850 950 1000 1050

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 100 – – – – –

Manifold Pressure In W.C. 2.5 3.5 3.5 2.5 2.5 2.5

Orice 43331090 43331090

++Contact local gas utility or distributor for Btu value of gas.



NOTE: For model 90-75 LP units only at altitudes above 5,000 ., install 90-75 High Altitude Orice Kit

#550001810*. For all other altitudes use factory installed orice.

TABLE #2: SERIES 90 PROPANE GAS

SERIES 90-50

Stock Factory Btu Value of LP Gas++

Settings 2300 2350 2400 2450 2500

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 50

– – – – –

Manifold Pressure In W.C. 2.5 3 3 2.5 2.5 2.5

Orice 43331095 43331095

SERIES 90-75*

Stock Factory Btu Value of LP Gas++

Settings 2300 2350 2400 2450 2500

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 75

– – – – –

Manifold Pressure In W.C. 2.5 3.5 3.5 3.5 3 3

Orice 43331093

43331096*

* For model 90-75 LP units only at altitudes above 5,000 ft., install 90-75 High Altitude Orice Kit #550001810. For all other alti-

tudes use factory installed orice.

SERIES 90-100

Stock Factory Btu Value of LP Gas++

Settings 2300 2350 2400 2450 2500

Altitude in Ft. 0-5,000 5,000-10,000

Normal Input (MBH) 100

– – – – –

Manifold Pressure In W.C. 2.5 3 3 3 2.5 2.5

Orice 43331091 43331091

++Contact local gas utility or distributor for Btu value of gas.



is boiler has been equipped for residential installations.

If used for commercial applications, any additional code

requirements must be adhered to for installation. is may

require additional controls including but not limited to a

low water cut o, a manual reset high temperature limit, and

wiring and/or piping modications. e manufacturer is

not responsible for any eld installation changes made to a

boiler installation which are not described or acknowledged

in this manual.

Complete all of the following prior to installing the boiler.



is boiler product is a gas-red, direct vent, condensing boiler

and must be installed in accordance with all applicable federal,

state and local building codes including, but not limited to the

following:

United States - Installation shall conform with National Fuel

Gas Code (NFPA-54/ANSI Z223.1-latest edition)

Canada - Installation shall be in accordance with CSA B 149.1

and .2. installation codes.

Where required by the authority having jurisdiction, the instal-

lation must conform to the American Society of Mechanical

Engineers Safety Code for Controls and Safety Devices for

Automatically Fired Boilers, No.CSD-1.





WARNING

Important - In the state of Massachusetts this product

must be installed by a licensed plumber or gas tter and the

installation must be in accordance with 248 CMR.

e installation must conform to the requirements of the author-

ity having jurisdiction or, in the absence of such requirements, to

the National Fuel Gas Code, ANSI Z223.1 - latest revision.

Installers - Follow local regulations with respect to installation

of CO (Carbon Monoxide) Detectors. Follow maintenance

recommendations in this manual.

Installation Requirements Specic To e State Of

Massachusetts

For Direct Vent, Mechanical Vent, And

Domestic Hot Water Appliances

For all side wall horizontally vented gas fueled equipment

installed in every dwelling, building or structure used in

whole or in part for residential purposes, including those

owned or operated by the commonwealth and where the

side wall exhaust vent termination is less than seven (7)

Read the entire installation manual before beginning the

installation. Failure to follow these rules for safe instal-

lation and operation and these instructions could cause

a malfunction of the boiler and result in death, serious

bodily injury, and/or property damage.

Check all applicable state and local building codes and

utility company requirements before installation. e

installation must conform with these requirements in their

entirety. In the absence of these codes, use NFPA Installa-

tion Codes and good industry practice.

Before servicing the boiler - allow the boiler to cool. Al-

ways shut o any electricity and gas supply connected to

the boiler prior to servicing.

Inspect gas line for leaks.

Be certain gas input rate is correct. Over ring may result

in early failure of the boiler sections. is may cause

dangerous operation. Under ring may result in too much

air for the pre-mix burner causing poor or loss of combus-

tion.

Never vent the products of combustion from this boiler

to an enclosed space. Always vent to the outdoors. Never

vent to another room or to inside a building.

Be sure there is adequate outdoor air supply to boiler for

complete combustion.

Follow a regular service and maintenance schedule for ef-

cient and safe operation.

Keep boiler area clean of debris and free of combustible

and ammable materials.

Proper through the wall or through the roof combustion

10.

venting shall be in accordance with the materials and

methods described in this manual. Installation must com-

ply with local codes.

is boiler and related hot water heating systems are not

11.

do it yourself items. ey must be installed and serviced by

qualied professionals.



feet above nished grade in the area of the venting, includ-

ing but not limited to decks and porches, the following

requirements shall be satised:

Installation of carbon monoxide detectors: at the time of

installation of the side wall horizontal vented gas fu-

eled equipment, the installing plumber or gastter shall

observe that a hard wired carbon monoxide detector with

an alarm and battery back-up is installed on the oor level

where the gas equipment is to be installed. In addition, the

installing plumber or gastter shall observe that a battery

operated or hard wired carbon monoxide detector with an

alarm is installed on each additional level of the dwelling,

building or structure served by the side wall horizontal

vented gas fueled equipment. It shall be the responsibility

of the property owner to secure the services of qualied

licensed professionals for the installation of hard wired

carbon monoxide detectors.

In the event that the side wall horizontally vented gas A.

fueled equipment is installed in a crawl space or an attic,

the hard wired carbon monoxide detector with alarm and

battery back-up may be installed on the next adjacent

oor level.

In the event that the requirements of this subdivision can B.

not be met at the time of completion of installation, the

owner shall have a period of thirty (30) days to comply

with the above requirements; provided, however, that

during said thirty (30) day period, a battery operated car-

bon monoxide detector with an alarm shall be installed.

Approved carbon monoxide detectors: each carbon mon-

oxide detector as required in accordance with the above

provisions shall comply with nfpa 720 and be ansi/ul 2034

listed and ias certied.

Signage: a metal or plastic identication plate shall be

permanently mounted to the exterior of the building at a

minimum height of eight (8) feet above grade directly in

line with the exhaust vent terminal for the horizontally

vented gas fueled heating appliance or equipment. e

sign shall read, in print size no less than one-half (1/2)

inch in size, “gas vent directly below. Keep clear of all

obstructions”.

Inspection: the state or local gas inspector of the side wall

horizontally vented gas fueled equipment shall not ap-

prove the installation unless, upon inspection, the inspec-

tor observes carbon monoxide detectors and signage

installed in accordance with the provisions of 248 cmr

5.08(2)(A)1 through 4.

Product-approved vent/air-intake: a product-approved

vent terminal must be used and, if applicable, a product-

approved air intake must be used. Installation shall be in

strict compliance with the manufacturer’s instructions.

Installation instructions: a copy of all installation instruc-

tions for all product approved side wall horizontally vent-

ed gas fueled equipment, all venting instructions, all parts

lists for venting instructions, and/or all venting design

instructions shall remain with the appliance or equipment

at the completion of the installation.



Check to be sure you have selected the boiler with the proper

capacity before starting the installation. e I=B=R Rating of

the boiler selected should be greater than or equal to the cal-

culated peak heating load (heat loss) for the building or area(s)

served by the boiler and associated hot water heating systems.

See the table “BOILER RATINGS AND CAPACITIES”.

Heat loss calculations should be based on approved industry

methods.



Before selecting a location for the boiler, the following should

be considered. Each boiler considered.

Supplied with the correct type of gas (natural gas or pro-•

pane).

Connected to a suitable combustion air intake piping sys-•

tem to supply the correct amounts of fresh (outdoor) air

for combustion, refer to Combustion Air And Vent Pipe

section (near center of this manual) for details.

Connected to a suitable venting system to remove the haz-•

ardous products of gas combustion, refer to Combustion

Air And Vent Pipe section (near center of this manual) for

details.

Connected to a suitable hot water heating system.•

Supplied with a suitable electrical supply for all boiler mo-•

tors and controls.

Connected to a properly located thermostat or operating •

control. (not included with boiler)

Placed on level surface (must NOT be installed on carpet-•

ing)

Condensate drain line must be pitched down to oor drain •

or external condensate pump with reservoir at ¼” per foot

(wood frame or blocks may be used to raise boiler).

TABLE #2 -

BOILER CLEARANCES

Unit

Combustible Clearance

Inch (mm)

Accessibility, Cleaning, and Servicing

Inch (mm)

Top 1 (25.4) 8 (203.2)

Left Side 1 (25.4) 24 (609.6)

Right Side 8 (203.2) -

Base 1 (25.4) -

Front 0 (0) 24 (609.6)

Back 1 (25.4) -

Intake/Vent Piping 0 (0) -

Near Boiler Hot Water Piping 1 (25.4) -

All distances measured from the cabinet of the boiler.





Select a location which is level, central to the piping sys-

tems served and as close to the vent and air intake termi-

nals as possible.

Accessibility clearances, if more stringent (i.e. larger clear-

ances) than required re protection clearances, must be

used for the boiler installation. Accessibility clearances

may be achieved with the use of removable walls or parti-

tions.

e boiler is approved for installation in closets and on

combustible oors. is boiler shall NOT be installed on

carpeting.

e clearances shown in Table #2 indicate required clear-

10.

ances per IAS listing. A minimum 1” clearance must be

maintained between combustible construction and each

of the le, top and back surfaces of the boiler. A minimum

8” clearance is required on the right side, to allow room

for the inlet air pipe. An 18” clearance must be maintained

at a side where passage is required to access another side

for cleaning or servicing, inspection or replacement of

any parts that normally may require such attention. Allow

at least 24” at the front and le side and 8” at the top for

servicing. No clearances are required to venting or com-

bustion air intake piping.

Equipment shall be installed in a location which facilitates

11.

the operation of venting and combustion air intake piping

systems as described in this manual.

Advise owner of boiler to keep venting and combustion

12.

air intake passages free of obstructions. both the venting

and combustion air intake piping systems connected to

the outdoors must permit ow through the piping systems

without restrictions for the boiler to operate.

e boiler shall be installed such that the automatic gas ig-

13.

nition system components are protected from water (drip-

ping, spraying, rain, etc.) during operation and service

(circulator replacement, control replacement, etc.).



is boiler requires a dedicated direct vent system. In a direct

vent system, all air for combustion is taken directly from

outside atmosphere, and all ue products are discharged to

outside atmosphere.

Combustion air and vent pipe connections must terminate to-

gether in the same atmospheric pressure zone, either through

the roof or sidewall (roof termination preferred). See

Figures

#9 & #10

(in Combustion Air And Vent Pipe section near

center of this manual) for required clearances.

When vent pipe is exposed to temperatures below freezing,

such as when it passes through an unheated space or when

a chimney is used as a raceway, vent pipe must be insulated

with 1/2” Armaex or equivalent. In extreme cold climate

areas, use ¾” Armaex or equivalent.

Combustion air must be clean outdoor air. Combustion

air must not be taken from inside structure because that

air frequently is contaminated by halogens, which include

uorides, chlorides, phosphates, bromides and iodides.

ese elements are found in aerosols, detergents, bleaches,

cleaning solvents, salts, air fresheners, paints, adhesives and

other household products.

Locate combustion air inlet as far away as possible from

swimming pool and swimming pool pump house.

All combustion air and vent pipes must be airtight and

watertight. Combustion air and vent piping must also ter-

minate exactly as shown in Figure #9 or 10 (in Combustion

Air And Vent Pipe section near center of this manual).

Vent connections serving appliances vented by natural dra

shall not be connected into any portion of mechanical dra

systems operating under positive pressure.

Solvent cements are combustible. Keep away from heat,

sparks, and open ame. Use only in well ventilated areas.

Avoid breathing in vapor or allowing contact with skin or

eyes.

FAILURE TO FOLLOW THE AFOREMENTIONED

WARNINGS COULD RESULT IN FIRE, PROPERTY

DAMAGE, PERSONAL INJURY, OR DEATH.

Keep boiler area clean of debris and free of amable and

combustible materials, vapors and liquids.



Condensate drain line to be pitched down to oor drain at a

minimum of ¼” per foot. An external condensate pump (not

furnished) may be used if oor drain is not available. e

condensate pump must be designed for ue gas condensate

application.



CAUTION

WARNING

Notes:

1. Condensate trap is built into the boiler, an external trap is

not required and should not be used.

2. Wood frame or blocks may be used to raise the boiler to

maintain drain pitch or to be above external condensate

pump reservoir.

3. ere is a 115 Volt AC receptacle provided on the service

switch junction box which is located at the boiler right

side, to provide power for an external condensate pump (if

needed).

on clothes dryer and any appliance not connected to the

common venting system. Turn on any exhaust fans, such

as range hoods and bathroom exhaust, so they will operate

at maximum speed. Close re dampers.

Place in operation the appliance being inspected. Follow

the lighting instructions. Adjust thermostat so appliances

will operate continuously.

Test for spillage at the dra hood relief opening aer 5

minutes of main burner operation. Use the ame of a

match or candle, or the smoke from a cigarette, cigar or

pipe.

Aer it has been determined that each appliance remain-

ing connected to the common venting system properly

vents when tested as outlined above, return doors, win-

dows, exhaust fans and any other gas-burning appliance to

their previous condition of use.

Any improper operation of the common venting system

should be corrected so the installation conforms with the

National Fuel Code, NFPA-54/ANSI -Z223.1-latest revi-

sion, or section 5 of CSA-B 149 for Canadian standards.

When resizing any portion of the common venting system,

the common venting system should be resized to approach

the minimum size as determined using the appropriate

tables in part 11 in the National Fuel Gas Code, NFPA-54/

ANSI- Z223.1-latest revision, or section 5 of CSA-B 149

for Canadian standards.



Boiler must be placed on level surface. Boiler is NOT to be

installed on carpeting.

Notes:

If boiler is not level condensate drain lines will not function

properly. Adjustable feet are located on the boiler to make

up for minor surface irregularities or tilt.

Wood frame or blocks may be used to raise boiler to main-

tain drain pitch or to be above external condensate pump

reservoir.





When an existing boiler is removed from a common venting

system, the common venting system is likely to be too large for

proper venting of the appliances remaining connected to it. At

the time of removal of an existing boiler, the following steps

shall be followed with each appliance remaining connected

to the common venting system placed in operation, while the

other appliances remaining connected to the common venting

system are not in operation.

Seal any unused openings in the common venting system.

Visually inspect the venting system for proper size and

horizontal pitch and determine there is no blockage, or re-

strictions, leakage, corrosion and other deciencies which

could cause an unsafe condition.

Insofar as is practical, close all building doors and win-

dows and all doors between the space in which the ap-

pliances remaining connected to the common venting

system are located and other spaces of the building. Turn



Copper supply and return piping must NOT be installed di-

rectly into aluminum boiler section casings due to galvanic

corrosion between dissimilar metals. Iron or steel bushings

or pipe nipples should be used between copper system pip-

ing and boiler to make nal connection to boiler. Also, the

use of dielectric unions is acceptable. e packaged boiler is

furnished with iron piping in the front boiler section for the

supply and return connections.

When the installation of the boiler is for a new heating system,

rst install all of the radiation units (panels, radiators, base-

board, or tubing) and the supply and return mains. Aer all

heating system piping and components have been installed,

make nal connection of the system piping to the boiler. A hot

water boiler installed above radiation level must be equipped

with a low water cut o device. A periodic inspection is neces-

sary us is ushing of oat type devices, per low water cut o

manufacturers specic instructions.



e packaged boiler unit is set up to receive 1

¼” NPT supply

and return piping from top access. e boiler unit can also

be piped from the le side by turning the supply elbow, and

from the rear of the unit by removing plugs in the rear boiler

section.

NOTE: e circulator pump and isolation valves are fur-

nished within a carton inside the boiler cabinet and can be

installed at the installer preferred location.



CAUTION



e boiler should be placed to provide the most direct connec-

tions to the combustion air, vent and system piping as possible.

Place crated boiler as close to selected location as possible and

uncrate boiler. e uncrated boiler may be moved into position

with an appliance dolly or 2-wheel hand truck. e dolly or

hand truck should be inserted under the le hand side of the

boiler. It is possible to slide the boiler for a short distance on a

smooth oor or surface.

Note: refer to manual section “locating the boiler” for

required clearances for servicing and maintenance.









NOTE: When zoning with circulators, the furnished circulator pump should be used as one of the zone

pumps. Each stripped end of the electrical wires for the circulator pump inside the junction box should be

taped or wire nutted to prevent short circuits. Unplug the circulator pump wiring at the integrated boiler

control.







e boiler is furnished with a factory installed relief valve in

the top of the boiler. Provide ¾” piping from the supplied

relief valve to a local oor drain, but leave an air gap between

piping and drain. No shuto of any description shall be placed

between safety relief valve and the boiler, or on the discharge

pipes between such safety valve and the atmosphere. Instal-

lation of the safety relief valve shall conform to ANSI/ASME

Boiler and Pressure Vessel Code, Section IV. e manufacturer

is not responsible for any water damage.



Determine required system ll pressure, system design tem-

perature, and system water content. Boiler contains 2.6 gallons

(U.S.). Size expansion tank accordingly. Consult expansion

tank manufacturer for proper sizing information. Connect

properly sized expansion tank (not furnished) as shown in

Figure #6 for diaphragm type expansion tank and

Figure #7

for conventional closed type expansion tanks. For diaphragm

type expansion tanks, adjust the tank air pressure to match the

system ll pressure. Install air vent (furnished) as shown for

diaphragm type expansion tank system only. Install make-

up water connections as shown per local codes. If a pressure

reducing valve is used, adjust to match the system ll pressure.

In connecting the cold make-up water supply to the boiler,

make sure that clean water supply is available. When the water

supply is from a well or pump, sand strainer should be installed

at the pump.













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Lennox Q90-100 Series IV Installation Instructions Manual

Brand: Lennox

Model: Q90-100 Series IV

Category: Water heaters & boilers

Type: Installation Instructions Manual

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Lennox Q90-100 Series IV Installation Instructions Manual

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Lennox Q90-100 Series IV Installation Instructions Manual

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